An important stage in global ocean overturning circulation is the upwelling of the Antarctic Bottom Water into the Pacific Deep Water (PDW). The long‐term evolution of PDW circulation, however, is scarcely addressed. We use seismic reflection data and cores from the International Ocean Discovery Program (and its predecessors) in contourites to reconstruct regional deep ocean circulation patterns. Here, we demonstrate that PDW circulation was progressively enhanced at about 4.35, 3.84, 2.16, and 0.97 Ma since the early Pliocene. Coeval growth of volcanic arcs and tectonic uplifts gradually isolated marginal seas from the PDW and, in conjunction with climate cooling, effectively increasing deep‐water flux within a shrinking Pacific basin. Regional stratigraphic discontinuities in contourites indicate thresholds in the intensification of ocean circulation. Plain Language Summary: Exchange of deep water between Antarctica and the Pacific Ocean is an essential component of global ocean circulation. Little is known about long‐term evolution of the Pacific Deep Water (PDW) circulation, one of the main deep ocean currents. We selected two distant areas in the northwest Pacific Ocean to study the internal structure and stratigraphy of deposits from deep water current, named contourites. Seismic stratigraphy analysis correlated with geochronological datasets from the International Ocean Discovery Program (and its predecessors) on well‐developed contourites allowed to reconstruct regional trends in deep water current behavior. Here, we demonstrate that the PDW regionally increased in strength with time throughout the early Pliocene, and notably at 4.35, 3.84, 2.16, and 0.97 Ma. We assign this change in current strength to the growth of numerous volcanic arcs and tectonic uplifts up to thresholds where these topographic highs gradually isolated marginal seas from the PDW in conjunction with the long‐term climate cooling during the Pleistocene. Key Points: Pacific Deep Water circulation progressively strengthened since the early PlioceneTectonic convergence with climate cooling drove circulation intensification by increasing water fluxThe circulation reached thresholds at 4.35 Ma, 3.84 Ma, 2.16 Ma, 0.97 Ma [ABSTRACT FROM AUTHOR]